I'm on a 2012 mac mini quad core looking just to capture my logitech c920 with a small PIP to the side of a game called "stepmania" which is just a DDR emulator if you're familiar. Not looking to stream, just record in 1080 quality and as it's a rhythm based game I'd like the audio/video to be in sync as possible/best framerate achievable. I've tinkered around a little with the "audio buffering time" and not making any progress. I'm hoping someone can just give me a rundown of preference changes I can make to get me on the right track.